ref: ea810eeed93cbc7e988f47841d26fc10f8c44c7c
dir: /src/v_video.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 1993-2008 Raven Software
// Copyright(C) 2005 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
// Gamma correction LUT stuff.
// Functions to draw patches (by post) directly to screen.
// Functions to blit a block to the screen.
//
//-----------------------------------------------------------------------------
#include <stdio.h>
#include <string.h>
#include "i_system.h"
#include "doomtype.h"
#include "deh_str.h"
#include "i_swap.h"
#include "i_video.h"
#include "m_bbox.h"
#include "m_misc.h"
#include "v_video.h"
#include "w_wad.h"
#include "z_zone.h"
// Blending table used for fuzzpatch, etc.
// Only used in Heretic/Hexen
byte *tinttable = NULL;
// The screen buffer that the v_video.c code draws to.
static byte *dest_screen = NULL;
int dirtybox[4];
//
// V_MarkRect
//
void V_MarkRect(int x, int y, int width, int height)
{
// If we are temporarily using an alternate screen, do not
// affect the update box.
if (dest_screen == I_VideoBuffer)
{
M_AddToBox (dirtybox, x, y);
M_AddToBox (dirtybox, x + width-1, y + height-1);
}
}
//
// V_CopyRect
//
void V_CopyRect(int srcx, int srcy, byte *source,
int width, int height,
int destx, int desty)
{
byte *src;
byte *dest;
#ifdef RANGECHECK
if (srcx < 0
|| srcx + width > SCREENWIDTH
|| srcy < 0
|| srcy + height > SCREENHEIGHT
|| destx < 0
|| destx + width > SCREENWIDTH
|| desty < 0
|| desty + height > SCREENHEIGHT)
{
I_Error ("Bad V_CopyRect");
}
#endif
V_MarkRect(destx, desty, width, height);
src = source + SCREENWIDTH * srcy + srcx;
dest = dest_screen + SCREENWIDTH * desty + destx;
for ( ; height>0 ; height--)
{
memcpy(dest, src, width);
src += SCREENWIDTH;
dest += SCREENWIDTH;
}
}
//
// V_DrawPatch
// Masks a column based masked pic to the screen.
//
void V_DrawPatch(int x, int y, patch_t *patch)
{
int count;
int col;
column_t *column;
byte *desttop;
byte *dest;
byte *source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
#ifdef RANGECHECK
if (x < 0
|| x + SHORT(patch->width) > SCREENWIDTH
|| y < 0
|| y + SHORT(patch->height) > SCREENHEIGHT)
{
I_Error("Bad V_DrawPatch");
}
#endif
V_MarkRect(x, y, SHORT(patch->width), SHORT(patch->height));
col = 0;
desttop = dest_screen + y * SCREENWIDTH + x;
w = SHORT(patch->width);
for ( ; col<w ; x++, col++, desttop++)
{
column = (column_t *)((byte *)patch + LONG(patch->columnofs[col]));
// step through the posts in a column
while (column->topdelta != 0xff)
{
source = (byte *)column + 3;
dest = desttop + column->topdelta*SCREENWIDTH;
count = column->length;
while (count--)
{
*dest = *source++;
dest += SCREENWIDTH;
}
column = (column_t *)((byte *)column + column->length + 4);
}
}
}
//
// V_DrawPatchFlipped
// Masks a column based masked pic to the screen.
// Flips horizontally, e.g. to mirror face.
//
void V_DrawPatchFlipped(int x, int y, patch_t *patch)
{
int count;
int col;
column_t *column;
byte *desttop;
byte *dest;
byte *source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
#ifdef RANGECHECK
if (x < 0
|| x + SHORT(patch->width) > SCREENWIDTH
|| y < 0
|| y + SHORT(patch->height) > SCREENHEIGHT)
{
I_Error("Bad V_DrawPatchFlipped");
}
#endif
V_MarkRect (x, y, SHORT(patch->width), SHORT(patch->height));
col = 0;
desttop = dest_screen + y * SCREENWIDTH + x;
w = SHORT(patch->width);
for ( ; col<w ; x++, col++, desttop++)
{
column = (column_t *)((byte *)patch + LONG(patch->columnofs[w-1-col]));
// step through the posts in a column
while (column->topdelta != 0xff )
{
source = (byte *)column + 3;
dest = desttop + column->topdelta*SCREENWIDTH;
count = column->length;
while (count--)
{
*dest = *source++;
dest += SCREENWIDTH;
}
column = (column_t *)((byte *)column + column->length + 4);
}
}
}
//
// V_DrawPatchDirect
// Draws directly to the screen on the pc.
//
void V_DrawPatchDirect(int x, int y, patch_t *patch)
{
V_DrawPatch(x, y, patch);
}
//
// V_DrawTLPatch
//
// Masks a column based translucent masked pic to the screen.
//
void V_DrawTLPatch(int x, int y, patch_t * patch)
{
int count, col;
column_t *column;
byte *desttop, *dest, *source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
if (x < 0
|| x + SHORT(patch->width) > SCREENWIDTH
|| y < 0
|| y + SHORT(patch->height) > SCREENHEIGHT)
{
I_Error("Bad V_DrawTLPatch");
}
col = 0;
desttop = dest_screen + y * SCREENWIDTH + x;
w = SHORT(patch->width);
for (; col < w; x++, col++, desttop++)
{
column = (column_t *) ((byte *) patch + LONG(patch->columnofs[col]));
// step through the posts in a column
while (column->topdelta != 0xff)
{
source = (byte *) column + 3;
dest = desttop + column->topdelta * SCREENWIDTH;
count = column->length;
while (count--)
{
*dest = tinttable[((*dest) << 8) + *source++];
dest += SCREENWIDTH;
}
column = (column_t *) ((byte *) column + column->length + 4);
}
}
}
//
// V_DrawAltTLPatch
//
// Masks a column based translucent masked pic to the screen.
//
void V_DrawAltTLPatch(int x, int y, patch_t * patch)
{
int count, col;
column_t *column;
byte *desttop, *dest, *source;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
if (x < 0
|| x + SHORT(patch->width) > SCREENWIDTH
|| y < 0
|| y + SHORT(patch->height) > SCREENHEIGHT)
{
I_Error("Bad V_DrawAltTLPatch");
}
col = 0;
desttop = dest_screen + y * SCREENWIDTH + x;
w = SHORT(patch->width);
for (; col < w; x++, col++, desttop++)
{
column = (column_t *) ((byte *) patch + LONG(patch->columnofs[col]));
// step through the posts in a column
while (column->topdelta != 0xff)
{
source = (byte *) column + 3;
dest = desttop + column->topdelta * SCREENWIDTH;
count = column->length;
while (count--)
{
*dest = tinttable[((*dest) << 8) + *source++];
dest += SCREENWIDTH;
}
column = (column_t *) ((byte *) column + column->length + 4);
}
}
}
//
// V_DrawShadowedPatch
//
// Masks a column based masked pic to the screen.
//
void V_DrawShadowedPatch(int x, int y, patch_t *patch)
{
int count, col;
column_t *column;
byte *desttop, *dest, *source;
byte *desttop2, *dest2;
int w;
y -= SHORT(patch->topoffset);
x -= SHORT(patch->leftoffset);
if (x < 0
|| x + SHORT(patch->width) > SCREENWIDTH
|| y < 0
|| y + SHORT(patch->height) > SCREENHEIGHT)
{
I_Error("Bad V_DrawShadowedPatch");
}
col = 0;
desttop = dest_screen + y * SCREENWIDTH + x;
desttop2 = dest_screen + (y + 2) * SCREENWIDTH + x + 2;
w = SHORT(patch->width);
for (; col < w; x++, col++, desttop++, desttop2++)
{
column = (column_t *) ((byte *) patch + LONG(patch->columnofs[col]));
// step through the posts in a column
while (column->topdelta != 0xff)
{
source = (byte *) column + 3;
dest = desttop + column->topdelta * SCREENWIDTH;
dest2 = desttop2 + column->topdelta * SCREENWIDTH;
count = column->length;
while (count--)
{
*dest2 = tinttable[((*dest2) << 8)];
dest2 += SCREENWIDTH;
*dest = *source++;
dest += SCREENWIDTH;
}
column = (column_t *) ((byte *) column + column->length + 4);
}
}
}
//
// Load tint table from TINTTAB lump.
//
void V_LoadTintTable(void)
{
tinttable = W_CacheLumpName("TINTTAB", PU_STATIC);
}
//
// V_DrawBlock
// Draw a linear block of pixels into the view buffer.
//
void V_DrawBlock(int x, int y, int width, int height, byte *src)
{
byte *dest;
#ifdef RANGECHECK
if (x < 0
|| x + width >SCREENWIDTH
|| y < 0
|| y + height > SCREENHEIGHT)
{
I_Error ("Bad V_DrawBlock");
}
#endif
V_MarkRect (x, y, width, height);
dest = dest_screen + y * SCREENWIDTH + x;
while (height--)
{
memcpy (dest, src, width);
src += width;
dest += SCREENWIDTH;
}
}
//
// Draw a "raw" screen (lump containing raw data to blit directly
// to the screen)
//
void V_DrawRawScreen(byte *raw)
{
memcpy(dest_screen, raw, SCREENWIDTH * SCREENHEIGHT);
}
//
// V_Init
//
void V_Init (void)
{
// no-op!
// There used to be separate screens that could be drawn to; these are
// now handled in the upper layers.
}
// Set the buffer that the code draws to.
void V_UseBuffer(byte *buffer)
{
dest_screen = buffer;
}
// Restore screen buffer to the i_video screen buffer.
void V_RestoreBuffer(void)
{
dest_screen = I_VideoBuffer;
}
//
// SCREEN SHOTS
//
typedef struct
{
char manufacturer;
char version;
char encoding;
char bits_per_pixel;
unsigned short xmin;
unsigned short ymin;
unsigned short xmax;
unsigned short ymax;
unsigned short hres;
unsigned short vres;
unsigned char palette[48];
char reserved;
char color_planes;
unsigned short bytes_per_line;
unsigned short palette_type;
char filler[58];
unsigned char data; // unbounded
} PACKEDATTR pcx_t;
//
// WritePCXfile
//
void WritePCXfile(char *filename, byte *data,
int width, int height,
byte *palette)
{
int i;
int length;
pcx_t* pcx;
byte* pack;
pcx = Z_Malloc (width*height*2+1000, PU_STATIC, NULL);
pcx->manufacturer = 0x0a; // PCX id
pcx->version = 5; // 256 color
pcx->encoding = 1; // uncompressed
pcx->bits_per_pixel = 8; // 256 color
pcx->xmin = 0;
pcx->ymin = 0;
pcx->xmax = SHORT(width-1);
pcx->ymax = SHORT(height-1);
pcx->hres = SHORT(width);
pcx->vres = SHORT(height);
memset (pcx->palette,0,sizeof(pcx->palette));
pcx->color_planes = 1; // chunky image
pcx->bytes_per_line = SHORT(width);
pcx->palette_type = SHORT(2); // not a grey scale
memset (pcx->filler,0,sizeof(pcx->filler));
// pack the image
pack = &pcx->data;
for (i=0 ; i<width*height ; i++)
{
if ( (*data & 0xc0) != 0xc0)
*pack++ = *data++;
else
{
*pack++ = 0xc1;
*pack++ = *data++;
}
}
// write the palette
*pack++ = 0x0c; // palette ID byte
for (i=0 ; i<768 ; i++)
*pack++ = *palette++;
// write output file
length = pack - (byte *)pcx;
M_WriteFile (filename, pcx, length);
Z_Free (pcx);
}
//
// V_ScreenShot
//
void V_ScreenShot(char *format)
{
int i;
char lbmname[12];
// find a file name to save it to
for (i=0; i<=99; i++)
{
sprintf(lbmname, format, i);
if (!M_FileExists(lbmname))
{
break; // file doesn't exist
}
}
if (i == 100)
{
I_Error ("V_ScreenShot: Couldn't create a PCX");
}
// save the pcx file
WritePCXfile(lbmname, I_VideoBuffer,
SCREENWIDTH, SCREENHEIGHT,
W_CacheLumpName (DEH_String("PLAYPAL"), PU_CACHE));
}